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REM sleep typically occupies 20â25% of total sleep in adult humans: about 90â120 minutes of a night's sleep. The first REM episode occurs about 70 minutes after falling asleep. Cycles of about 90 minutes each follow, with each cycle including a larger proportion of REM sleep.
REM periods vary in length from 5 to 10 minutes for the first REM period of the night to as long as 30-34 minutes later in the night. It thus seems likely that dreams can be a half hour or more in length.